code: def test_line_plot(self):
      def check_line_plot(pdf, psdf):
          self.assertEqual(
              pdf.plot(kind="line"), psdf.plot(kind="line")
          )
          self.assertEqual(pdf.plot.line(), psdf.plot.line())
  
      pdf1 = self.pdf1
      psdf1 = self.psdf1
      check_line_plot(pdf1, psdf1)
  
imports: import unittest
  import pprint
  import pandas
  import numpy
  from pyspark import pandas
  from pyspark.pandas.config import set_option, reset_option
  from pyspark.testing.pandasutils import have_plotly, plotly_requirement_message, PandasOnSparkTestCase, TestUtils
  from pyspark.pandas.utils import name_like_string
label_desc: Use image node_id 5 for calling the DataFramePlotPlotlyTestsMixin obj's underlying member method code with example usage: obj.test_line_plot() without return types